US3539734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic tape recorder operating system
Assignee: Teac Corp
•
Filing: 1968-03-06
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Granted: 1970-11-10
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Expires: 1988-03-06
Abstract
No abstract record available.
Inventors
- 👤 Yoichi Tsuchiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:06
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G09; G09B; G09B5/00; G09B5/04; G11B15/18; G11B15/44; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3018
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |